Luobusaite Mineral Data

General Luobusaite Information

Chemical Formula:

Fe0.83Si2

Composition:

Molecular Weight = 102.52 gm

Iron 45.21 % Fe

Silicon 54.79 % Si

______

100.00 %

Empirical Formula:

Fe²⁺_0.83Si₂

Environment:

Recovered from a crushed and sieved fraction from a podiform chromitite in ophiolite.

IMA Status:

Approved IMA 2006 (Dana # Added)

Locality:

Luobusa mine, Indus-Yarlung Zangbo suture zone, Qusong County, Tibet Autonomous Region, Peopleï¿½s Republic of China. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA2005-052a

Luobusaite Crystallography

Axial Ratios:

a:b:c =1.2684:1:1.0057

Cell Dimensions:

a = 9.874, b = 7.784, c = 7.829, Z = 16; V = 601.73 Den(Calc)= 4.53

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mca

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.844(1), 3.06(0.8), 1.889(0.6),1.865(0.4), 1.977(0.4), 2.402(0.25), 2.849(0.2), 1.75(0.15),

Physical Properties of Luobusaite

Cleavage:

None

Color:

Steel gray.

Diaphaneity:

Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.

Hardness:

7 - Quartz

Luster:

Metallic

Streak:

black

Optical Properties of Luobusaite

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Luobusaite in Air**
λ	R	∑ R(λ)
400 nm	49.63
470 nm	44.41
540 nm	46.46
580 nm	49.71
650 nm	46.89
700 nm	47.74

**Calculated Relative Intensity Colors of Luobusaite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R

Calculated Properties of Luobusaite

Electron Density:

Bulk Density (Electron Density)=4.38 gm/cc
note: Specific Gravity of Luobusaite =4.53 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Luobusaite= 15.40 barns/electron
U=PE_Luobusaite x rElectron Density= 67.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Luobusaite is Not Radioactive

Luobusaite Classification

Dana Class:

01.01.23.05 (01)Native Elements

(01.01)with metallic elements other than the platinum group

(01.01.23)Suessite Group silicides

01.01.23.01 Suessite (Fe,Ni)3Si I m3m 4/m 3 2/m

01.01.23.02 Gupeiite Fe3Si F m3m 4/m 3 2/m

01.01.23.03 Xifengite Fe5Si3 P 6₃/mcm 6/m 2/m 2/m

01.01.23.04 Hapkeite! Fe2Si P m3m 4/m 3 2/m

01.01.23.05 Luobusaite! Fe0.83Si2 C mca 2/m 2/m 2/m

01.01.23.06 Mavlyanovite! Mn5Si3 P 6₃/mcm 6/m 2/m 2/m

01.01.23.07 Brownleeite! MnSi P 2₁3 2 3

Strunz Class:

01.BB.25 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)

01.B - Metallic Carbides, Silicides, Nitrides and Phosphides

01.BB -Silicides

01.BB.25 Luobusaite! Fe0.83Si2 C mca 2/m 2/m 2/m

Other Luobusaite Information

References:

NAME( AmMin, v92:1540) PHYS. PROP.(AmMin, v92:1540) OPTIC PROP.(AmMin, v92:1540)

See Also:

Links to other databases for Luobusaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Luobusaite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Luobusaite :

Ask about Luobusaite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Luobusaite Specimen Label here :

Luobusaite

Fe0.83Si2
Dana No: 01.01.23.05 Strunz No: 01.BB.25
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.